Pump unit



June 27, 1933.

Fig.1

PUMP UN I T Filed May 2, 1929 5 Sheets-Sheet 1 June 27, 1933. 1', JKICKLER 1,915,827

PUMP UN I T Filed May 2, 1929 3 Sheets-Sheet 2 June 27, 1933. T. J.KICKLER 7 PUMP UNIT Filed May 2, 1929 3 Sheets-Sheet 3 Fig.6

Patented June 27, 1933 UNITED STATES PATENT OFFICE THOMAS 3'. 11mmQUINCY, ASBIGNQB '1'0 IODERN IRON WORKS, 0] QUINCY, ILLINOIS, 'GOBPQBLTION OF ILLINOIS Pm UNIT Application filed lay A,

This invention relates to a pump unit comrising a motor, a pump, andmeans for drivmg the pump from the motor.

An object of the invention is to provide'a unit of the class mentionedin which the parts are compactly arranged and are simplified and at thesame time the transmission of power is effected in such a manner thatthe parts are subjected to a minimum of jar or unbalanced stress. Otherdetails and objects of the invention will appear as the descriptionproceeds. Y

In the accompanying drawings forming a part of this specification,Figure 1 is a side elevation of a unit embodying the invention, partlybroken away; Figure 2 is a plan view of the parts shown in Figure 1;Figure 3 s an elevation of the pump, viewed from the right of Fi re 1Figure 4 is a section on the line 44 0 Figure 3; Figures 5, 6 and 7 arediagrammatic views of the driving connections to the pump, arranged inthree different ways.

In the apparatus disclosed, th ere is a base 10 having attached theretoa block 11 on which there is mounted a motor 12. The shaft 13 ofthe-motor is connected by a coupling 14 with a shaft 15 which drives aworm 16 engaging a wormwheel17 mounted upon a shaft 18 in a casing 19attached to the base 10, at one side of block 11. Shaft 18' is providedat each end with a crank arm 20. Pivoted' at 21 to these crank armsthere are bent links 22 which have their upper ends pivoted at 23 to anend of a lever 24 directly above worm 16. Lever 24 is provided with afloatingfulcrum 25 which is attached by links 26, similar to links 22,to the block 11 by pivots 27.

Attached to base 10 at the right of block 11, as viewed in Figure 1,there is a bracket 28 having therein a chamber 29. To the under side ofbracket 28 there is attached the pump pipe 30, and at the right ofchamber 29there is an internally threaded boss 31 to which may beattached a suitable discharge pipe. Attached to the upper-side ofbracket 28, in alignment with pipe 30, there is a cylinder 32 withinwhich there are pistons 33 and 34 upon a piston rod 35 which extendsdownward through chamber 29 and pipe to a pump m2. Serial No. 808,868.

ingcylinder, not shown. Mounted upon the upper side of bracket 28 thereis a bracket 36 substantially inverted U-shaped and having the bottomsof its legs bolted to casting 28, and being provided at its upper endwith a guide 37 for piston rod 35, and also being provided with a crossiece 38 above cylinder 32 cross piece 38 bein likewise provided with aguiding perforation receiving piston rod 35.

Between cross piece 38 and boss 37 there is attached to piston rod ablock 39 by means of suitable fastening devices 40. Block 39 is pivotedat 40 (see Fig. 3) to the forked end with cylinder 32 and attached tothe upper side of casting 28. Air is admitted to cylinder 47 through anopening48 and a check valve not shown, and upon downward movement ofpiston 46 the air is driven into chamber 29 past check valve 49.

It will be readily understood that the motor drives worm 16 and therebyturns worm wheel 17, shaft 18 and cranks 20, and by means of links '22alternately lowers and raises the left 'end of lever 24, as viewed inFigure 1. This lever transmits the motion to piston rods 35 and 43thereby drives the pump, floatingfulcrum 25 being allowed to movehorizontally by the oscillation of links 26 to accommodate the motion ofthe lever to a straight line vertical motion of the piston rods.

The positioningof shaft 18 with respect to pivot 23 and of pivots 27with respect to fulcrum 25 modifies the lateral force exerted' upon thepiston rods. This is illustrated in diagrammatic views 5, 6 and 7. InFigure 5, shaft 18 'is shown vertically be-. neath pivot 23, and pivots27 are shown vertically beneath fulcrum 25, when lever 24 is insubstantially horizontal position. It will be understood that, as thelever oscillates in either direction from its horizontal position,fulcrum 25 is swung to the right because of the vertical movement of thepivot 40' guided by plunger piston rod 35. In the construction shown inFigure 5, downward movement of crank 20 from the position shown in thedirection of arrow 50 exerts a component of force horizontally to theright on lever v22 in addition to the downward component of force. Asthe fulcrum 25 moves to the right, the reaction of the fulcrum likewiseexerts a component of force to the right on lever 24, and in that waythere is a lateral force applied to piston rod 35 inaddition to thevertical liftingforce.

In Figure 6 the position of the pivots is modified, shaft 18 being movedslightly to the left of a position directly beneath pivot 23, and pivot27 being moved slightly to the right of a position directly beneathfulcrum 25. In this construction it will be seen that, when the crankarm 20 moves downward in the direction of arrow 50, the horizontalcomponent of force exerted by links '22 upon lever 24 is at leastpartially counter-balanced by the horizontalcomponent of force in theopposite direction exerted by the inclined link 26 upon fulcrum 25. Asthe crank arm continues to move downward, the horizontal component offorce exerted by link 22 is lessened by the movement of pivot 23 to theright and the movementof pivot 21 to the left. At the same time fulcrum25 moves to the right so as to lessen the horizontal component of forceof link 26. In this way the positioning of the pivots as shown in Figure6 tends to reduce the horizontal component'of force exerted upon thepiston rod 35 during the downward movement of links 22 and the upwardmovement of the piston rod. It will be readily seen that when pivot 21passes its downward position and starts upward, it will be out ofalignment so that it would exert a considerable horizontal component offorce which would not be balanced by the position of link 26; but theweight of piston rod 35 and. connected parts ordinarily is sufficient tolower the piston rod so that the work done by the motor in raising theleft 29 end of lever 24', and lowering the piston rod, is comparativelylittle and, therefore, the horizontal component of this small force isnot serious.

In the construction shown in Figure 7, the positioning of therelativepivot points is reversed from that shown in Figure 6 to accord with thereversed direction of movement of arm 20, as indicated by arrow 51. Thisis, shaft 18 is positioned to the right of a point directly beneathpivot 23 when lever 24 is in horizontal posltion, and pivot 27 is to theleft of a point directly beneathfloating fulcrum 25. In the positionshown in Figure 7, it will be seen that the horizon around the left sideof shaft 18, it will be seen that it is more nearly vertically beneathpivot 23 than it would be if shaft 18 was directly beneath pivot. 23.Likewise" the inclined position of links 26 tends to counter-ba'lancevthe horizontal component of force to the left exerted-by legs 22 intheir downward movement in a manner similar to that described above inconnection with Figure 6. In other words, in order to reduce thehorizontal component of force exerted on pivot 40 to a minimum when themajor force is exerted during the upward stroke of the piston rod, it isdesirable to have pivot oint 27 and shaft 18 farther apart than ulcrum25 and pivot 23 when crank arm 20 moves in a clockwise direction, asviewed in Figure 6, and to have shaft 18 and pivot point 27 nearertogether than pivot 23 and fulcrum 25 when arm 20 rotates in ananti-clockwise direction, as viewed in Figure 7.

In the construction shown, it will be seen that piston 33 is of smallerdiameter than pipe 30, and it will be understood that it is of smallerdiameter than the pump piston,

not sh'own, at the lower end of piston rod 35.

When piston rod 35 is raised, it will be readily understood that theliquid above the comparatively large piston on the lower end of pistonrod 35 will be raised and forced into chamber 29. Part of this will beallowed to rise into cylinder 32 by the upward movement of piston rod 33while part is discharged from chamber 29. During the downward movementof piston rod 35, it will be readily understood that downward movementof the liquid in pipe 30 is prevented by the usual check valve in thepump cylinder, not shown, at the lower end of piston rod 35. Inaddition, the lowering of piston 33 drives the liquid out of cylinder 32and into chamber and thereby liquid is discharged from chamber 29 on thedownward as well as on the upward stroke of piston 35. At the same timeair is compressed beneath piston 46 and,

if this compression is sufiicient to overcome piston rod, in proportionto the force exerted on the piston rod during its downward movement,depends upon a lurality of factors, including the distance 0 the mainpump cylinder below chamber 29 and the relative size of piston 33 andthe main pump iston. Under some circumstances these actors might be soadjusted as to nearly equalize the force required for lifting the pistonrod and forcing it downward, under which circumstances an arrangementsuch as shown in Figure 5, with shaft 18 directly beneath pivot 23 andpivot 27 directly beneath fulcrum 25, would be preferable for eitherdirection of rotation of shaft 18.

It will be seen that the described construction provides a very compactarrangement of parts with a minimum of moving parts for the transmissionof power to the piston rod and with comparatively little horizontalcomponent of force exerted upon the piston rod in view of the simplifiedarrangement for the transmission of power.

While the preferred construction has been disclosed in considerabledetail, it will be readily understood that various changes may be madein the exact constructionwithin the terms of the appended claims.

What is claimed is 1. In a pump unit, an elongated base, a motor mountedupon the base with its power shaft longitudinal of the base, a worm onone end of said shaft, a worm wheel meshing with said worm, a shaftcarrying said worm wheel and mounted across said base and having a crankarm on each end thereof, a pump portion connected to the base on theother side of the motor from said crank shaft and comprising avertically guided piston rod, links mounted upon opposite sides of saidmotor and extending upward and towards each other above the motor andsupporting a floating fulcrum pin, a lever fulcrumed upon said pin andpivoted at one end to said piston rod, and links pivoted at their lowerends to said crank arms and extending upward and towards each other andpivoted at their upper ends to the other end of said lever.

2. A pump unit in accordance with claim 1 and in which the forcerequired to move the piston in one direction is greater than the forcerequired to move it in the other direction, and the distance between theends of the crank shaft and the points at which the fulcrum links arepivoted to the base is different from the distance between the fulcrumpin and the point Where the crank links are pivoted to the lever, andthe difference is in a direction to lessen the horizontal thrust uponthe lever during its movement in the direction requiring most force.

3. A pump unit in accordance with claim 1 and in which more force isrequired to raise the piston than to lower it, the ends of the crankarms move downward on the side of the crank shaft towards the motor, andthe distance between the ends of the crank shaft and the points wherethe fulcrum links are pivoted to the base is greater than the distancebetween the fulcrum pin and the point where the crank links are pivotedto the lever.

41. A pump unit in accordance with claim l and in which more force isrequired to raise the piston than to lower it, the ends of the crankarms move upward on the side of the crank shaft towards the motor, andthe distance between the ends of the crank shaft and. the points wherethe fulcrum links are pivoted to the base is less than the distancebetween the fulcrum pin and the point where the crank links are pivotedto the lever.

In testimony whereof I have hereunto signed my name to thisspecification.

THOMAS J. KICKLER.

